A Retort Stand PS/PPis a piece of laboratory equipment used to support and stabilize flasks, test tubes, or other containers during heating or chemical reactions. Retort stands made of PS (polystyrene) or PP (polypropylene) are lightweight and inexpensive materials that offer good stability and durability.

They can come in a variety of designs and can include adjustable clamps or grips to secure containers in place during experiments. The PS/PP retort stands are typically used in educational and research settings in chemistry, biology, and other sciences.